'87 4kq brake pressure regulator

[DBF]

Good Day All, 

The Brake Pressure Regulator, part # 803 612 303, on my 87 4000q has taken to leaking.  The port to the left of the regulator is weeping.  I was wondering if this is a common problem, or if a used unit would suffice.  I've priced them and they come in at $225CAN.  If I can avoid a 2 hundred dollar expense on a $400 car, I certainly will.  Any BTDTs?

Regards,

Dan